java 获取用户真实ip

/**
         * 获取用户真实ip
         * @param request
         * @return
         */
        public static String getIpAddr(HttpServletRequest request){
            String ip = request.getHeader("x-forwarded-for");
            if ((ip == null) || (ip.length() == 0) || ("unknown".equalsIgnoreCase(ip))) {
              ip = request.getHeader("Proxy-Client-IP");
            }
            if ((ip == null) || (ip.length() == 0) || ("unknown".equalsIgnoreCase(ip))) {
              ip = request.getHeader("WL-Proxy-Client-IP");
            }
            if ((ip == null) || (ip.length() == 0) || ("unknown".equalsIgnoreCase(ip))) {
              ip = request.getRemoteAddr();
            }
            return ip;
        }

public static String getIpAddr(HttpServletRequest request) {
    String ip = request.getHeader("X-Forwarded-For");

    if (logger.isInfoEnabled()) {
        logger.info("###getIpAddress(HttpServletRequest) - X-Forwarded-For - String ip=" + ip);
    }

    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("Proxy-Client-IP");
            if (logger.isInfoEnabled()) {
                logger.info("###getIpAddress(HttpServletRequest) - Proxy-Client-IP - String ip=" + ip);
            }
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("WL-Proxy-Client-IP");
            if (logger.isInfoEnabled()) {
                logger.info("###getIpAddress(HttpServletRequest) - WL-Proxy-Client-IP - String ip=" + ip);
            }
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("HTTP_CLIENT_IP");
            if (logger.isInfoEnabled()) {
                logger.info("###getIpAddress(HttpServletRequest) - HTTP_CLIENT_IP - String ip=" + ip);
            }
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("HTTP_X_FORWARDED_FOR");
            if (logger.isInfoEnabled()) {
                logger.info("###getIpAddress(HttpServletRequest) - HTTP_X_FORWARDED_FOR - String ip=" + ip);
            }
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
            if (logger.isInfoEnabled()) {
                logger.info("###getIpAddress(HttpServletRequest) - getRemoteAddr - String ip=" + ip);
            }
        }
    } else if (ip.length() > 15) {
        String[] ips = ip.split(",");
        for (int index = 0; index < ips.length; index++) {
            String strIp = (String) ips[index];
            if (!("unknown".equalsIgnoreCase(strIp))) {
                ip = strIp;
                break;
            }
        }
    }
    logger.info("####解析请求的浏览器IP："+ip);
    return ip;
}